C #---A program for asymmetric encryption

Program | encryption using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;
Using System.IO;
Using System.Text;
Using System.Security.Cryptography;

Namespace Asymmetric Encryption
{
<summary>
Summary description of the Form1.
</summary>
public class Form1:System.Windows.Forms.Form
{
Private System.Windows.Forms.TabControl tabControl1;
Private System.Windows.Forms.TabPage TabPage1;
Private System.Windows.Forms.TabPage TabPage2;
Private System.Windows.Forms.Button button1;
Private System.Windows.Forms.Button button2;
Private System.Windows.Forms.Button Button3;
Private System.Windows.Forms.SaveFileDialog Save;
Private System.Windows.Forms.Label Label1;
Private System.Windows.Forms.TextBox TextBox1;
Private System.Windows.Forms.Button Button4;
Private System.Windows.Forms.Button button5;
Private System.Windows.Forms.Label Label2;
Private System.Windows.Forms.RichTextBox richtext2;
Private System.Windows.Forms.OpenFileDialog Open;
Private System.Windows.Forms.Label label3;
Private System.Windows.Forms.RichTextBox richtext3;
Private System.Windows.Forms.RichTextBox RichText;
Private System.Windows.Forms.Button Button6;
Private System.Windows.Forms.Button button7;
Private System.Windows.Forms.Button Button8;
<summary>
The required designer variable.
private static RSACryptoServiceProvider crypt;
private static string Privatekey;
private static string PublicKey;
private static byte [] bytes;
private static string Publicinfo;
private static string PrivateInfo;
private static string Readpublickey;
private static string Readprivatekey;
private static byte [] onebytes;


</summary>
Private System.ComponentModel.Container components = null;

Public Form1 ()
{
//
Required for Windows Forms Designer support
//
InitializeComponent ();

//
TODO: Add any constructor code after the InitializeComponent call
//
}

<summary>
Clean up all resources that are in use.
</summary>
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

Code generated #region the Windows forms Designer
<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</summary>
private void InitializeComponent ()
{
This.tabcontrol1 = new System.Windows.Forms.TabControl ();
This.tabpage1 = new System.Windows.Forms.TabPage ();
This.button6 = new System.Windows.Forms.Button ();
This.button3 = new System.Windows.Forms.Button ();
This.button2 = new System.Windows.Forms.Button ();
This.richtext = new System.Windows.Forms.RichTextBox ();
This.button1 = new System.Windows.Forms.Button ();
This.tabpage2 = new System.Windows.Forms.TabPage ();
This.button8 = new System.Windows.Forms.Button ();
this.button7 = new System.Windows.Forms.Button ();
This.label3 = new System.Windows.Forms.Label ();
THIS.RICHTEXT3 = new System.Windows.Forms.RichTextBox ();
This.label2 = new System.Windows.Forms.Label ();
THIS.RICHTEXT2 = new System.Windows.Forms.RichTextBox ();
This.button5 = new System.Windows.Forms.Button ();
This.button4 = new System.Windows.Forms.Button ();
This.textbox1 = new System.Windows.Forms.TextBox ();
This.label1 = new System.Windows.Forms.Label ();
This.save = new System.Windows.Forms.SaveFileDialog ();
This.open = new System.Windows.Forms.OpenFileDialog ();
This.tabControl1.SuspendLayout ();
This.tabPage1.SuspendLayout ();
This.tabPage2.SuspendLayout ();
This. SuspendLayout ();
//
TabControl1
//
THIS.TABCONTROL1.CONTROLS.ADD (THIS.TABPAGE1);
THIS.TABCONTROL1.CONTROLS.ADD (This.tabpage2);
This.tabControl1.Location = new System.Drawing.Point (32, 64);
This.tabControl1.Name = "TabControl1";
This.tabControl1.SelectedIndex = 0;
This.tabControl1.Size = new System.Drawing.Size (416, 280);
This.tabControl1.TabIndex = 0;
//
TabPage1
//
THIS.TABPAGE1.CONTROLS.ADD (THIS.BUTTON6);
THIS.TABPAGE1.CONTROLS.ADD (This.button3);
THIS.TABPAGE1.CONTROLS.ADD (This.button2);
THIS.TABPAGE1.CONTROLS.ADD (This.richtext);
THIS.TABPAGE1.CONTROLS.ADD (This.button1);
This.tabPage1.Location = new System.Drawing.Point (4, 21);
This.tabPage1.Name = "TabPage1";
This.tabPage1.Size = new System.Drawing.Size (408, 255);
This.tabPage1.TabIndex = 0;
This.tabPage1.Text = "Get the key";
//
Button6
//
This.button6.Location = new System.Drawing.Point (72, 168);
This.button6.Name = "Button6";
This.button6.TabIndex = 4;
This.button6.Text = "Write file";
This.button6.Click + = new System.EventHandler (This.button6_click);
//
Button3
//
This.button3.Location = new System.Drawing.Point (200, 16);
This.button3.Name = "Button3";
This.button3.TabIndex = 3;
This.button3.Text = "Save private key";
This.button3.Click + = new System.EventHandler (This.button3_click);
//
Button2
//
This.button2.Location = new System.Drawing.Point (128, 16);
This.button2.Name = "Button2";
This.button2.TabIndex = 2;
This.button2.Text = "Save Public key";
This.button2.Click + = new System.EventHandler (This.button2_click);
//
RichText
//
This.richtext.Location = new System.Drawing.Point (16, 56);
This.richtext.Name = "RichText";
This.richtext.Size = new System.Drawing.Size (256, 96);
This.richtext.TabIndex = 1;
This.richtext.Text = "RichTextBox1";
//
Button1
//
This.button1.Location = new System.Drawing.Point (8, 16);
This.button1.Name = "Button1";
This.button1.Size = new System.Drawing.Size (88, 23);
This.button1.TabIndex = 0;
This.button1.Text = "Get key Information";
This.button1.Click + = new System.EventHandler (This.button1_click);
//
TabPage2
//
THIS.TABPAGE2.CONTROLS.ADD (THIS.BUTTON8);
THIS.TABPAGE2.CONTROLS.ADD (this.button7);
THIS.TABPAGE2.CONTROLS.ADD (THIS.LABEL3);
THIS.TABPAGE2.CONTROLS.ADD (THIS.RICHTEXT3);
THIS.TABPAGE2.CONTROLS.ADD (THIS.LABEL2);
THIS.TABPAGE2.CONTROLS.ADD (THIS.RICHTEXT2);
THIS.TABPAGE2.CONTROLS.ADD (THIS.BUTTON5);
THIS.TABPAGE2.CONTROLS.ADD (THIS.BUTTON4);
THIS.TABPAGE2.CONTROLS.ADD (This.textbox1);
THIS.TABPAGE2.CONTROLS.ADD (THIS.LABEL1);
This.tabPage2.Location = new System.Drawing.Point (4, 21);
This.tabPage2.Name = "TabPage2";
This.tabPage2.Size = new System.Drawing.Size (408, 255);
This.tabPage2.TabIndex = 1;
This.tabPage2.Text = "Encrypt and decrypt text";
//
Button8
//
This.button8.Location = new System.Drawing.Point (216, 72);
This.button8.Name = "Button8";
This.button8.TabIndex = 9;
This.button8.Text = "Read Private key";
This.button8.Click + = new System.EventHandler (This.button8_click);
//
Button7
//
This.button7.Location = new System.Drawing.Point (56, 72);
This.button7.Name = "button7";
This.button7.TabIndex = 8;
This.button7.Text = "reading public key";
This.button7.Click + = new System.EventHandler (This.button7_click);
//
Label3
//
This.label3.Location = new System.Drawing.Point (200, 120);
This.label3.Name = "Label3";
This.label3.Size = new System.Drawing.Size (100, 16);
This.label3.TabIndex = 7;
This.label3.Text = "decryption result";
//
Richtext3
//
This.richtext3.Location = new System.Drawing.Point (200, 144);
This.richtext3.Name = "RICHTEXT3";
This.richtext3.Size = new System.Drawing.Size (120, 72);
This.richtext3.TabIndex = 6;
This.richtext3.Text = "RichTextBox2";
//
Label2
//
This.label2.Location = new System.Drawing.Point (48, 120);
This.label2.Name = "Label2";
This.label2.Size = new System.Drawing.Size (128, 16);
This.label2.TabIndex = 5;
This.label2.Text = "Encrypt window:";
//
Richtext2
//
This.richtext2.Location = new System.Drawing.Point (40, 144);
This.richtext2.Name = "Richtext2";
This.richtext2.Size = new System.Drawing.Size (120, 72);
This.richtext2.TabIndex = 4;
This.richtext2.Text = "RichTextBox2";
//
Button5
//
This.button5.Location = new System.Drawing.Point (200, 96);
This.button5.Name = "Button5";
This.button5.Size = new System.Drawing.Size (112, 23);
This.button5.TabIndex = 3;
This.button5.Text = "Decryption using private key";
This.button5.Click + = new System.EventHandler (This.button5_click);
//
Button4
//
This.button4.Location = new System.Drawing.Point (48, 96);
This.button4.Name = "Button4";
This.button4.Size = new System.Drawing.Size (96, 23);
This.button4.TabIndex = 2;
This.button4.Text = "Use public key Encryption";
This.button4.Click + = new System.EventHandler (This.button4_click);
//
TextBox1
//
This.textBox1.Location = new System.Drawing.Point (104, 32);
This.textBox1.Multiline = true;
This.textBox1.Name = "TextBox1";
This.textBox1.Size = new System.Drawing.Size (168, 32);
This.textBox1.TabIndex = 1;
This.textBox1.Text = "TextBox1";
//
Label1
//
This.label1.Location = new System.Drawing.Point (128, 8);
This.label1.Name = "Label1";
This.label1.Size = new System.Drawing.Size (120, 16);
This.label1.TabIndex = 0;
This.label1.Text = "Please enter the encrypted text";
//
Form1
//
This. AutoScaleBaseSize = new System.Drawing.Size (6, 14);
This. ClientSize = new System.Drawing.Size (504, 357);
This. Controls.Add (THIS.TABCONTROL1);
This. Name = "Form1";
This. Text = "Form1";
This.tabControl1.ResumeLayout (FALSE);
This.tabPage1.ResumeLayout (FALSE);
This.tabPage2.ResumeLayout (FALSE);
This. ResumeLayout (FALSE);

}
#endregion

<summary>
The main entry point for the application.
</summary>
[STAThread]
static void Main ()
{
Application.Run (New Form1 ());
}
Get key information
private void Button1_Click (object sender, System.EventArgs e)
{
Crypt=new RSACryptoServiceProvider ();
Publickey=crypt. Toxmlstring (FALSE);
RichText. text= "Export secret key: \ n" +publickey+ "\ n";
Privatekey=crypt. Toxmlstring (TRUE);
String info= "Only export the public key: \ n" +privatekey+ "\ n";
RichText. AppendText (info);
Crypt. Clear ();

}
Save Public Key Information
private void Button2_Click (object sender, System.EventArgs e)
{

Save=new SaveFileDialog ();
Save. Filter= "File Text (*.txt) |*.txt| All File (*.*) |*.* ";
Save. ShowDialog ();
Publicinfo=save. FileName;

}
Save key information
private void Button3_Click (object sender, System.EventArgs e)
{
Save=new SaveFileDialog ();
Save. Filter= "File Text (*.txt) |*.txt| All File (*.*) |*.* ";
Save. ShowDialog ();
Privateinfo=save. FileName;

}
Write key information to a file
private void Button6_click (object sender, System.EventArgs e)
{

StreamWriter One=new StreamWriter (Publicinfo,true,utf8encoding.utf8);
One. Write (PublicKey);
StreamWriter Two=new StreamWriter (Privateinfo,true,utf8encoding.utf8);
Two. Write (Privatekey);
One. Flush ();
Two. Flush ();
One. Close ();
Two. Close ();
MessageBox.Show ("Save the public key and keys successfully!") ");

}
Encrypt with a public key
private void Button4_Click (object sender, System.EventArgs e)
{

Crypt=new RSACryptoServiceProvider ();
UTF8Encoding enc=new utf8encoding ();
Bytes=enc. GetBytes (TextBox1.Text);
Crypt. Fromxmlstring (Readpublickey);
bytes = Crypt. Encrypt (Bytes,false);
String Encryttext=enc. GetString (bytes);//encryptbyte);
Richtext2. text= "Encryption result: \ n" +encryttext+ "\ n" + "Encryption end!" ";
}

private void Button5_click (object sender, System.EventArgs e)
{

UTF8Encoding enc=new utf8encoding ();
byte [] decryptbyte;
Crypt. Fromxmlstring (Readprivatekey);
Decryptbyte = Crypt. Decrypt (Bytes,false);
String Decrypttext=enc. GetString (Decryptbyte);
Richtext3. Text = "decryption result: \ n" + decrypttext + "\ n" + "decryption end!" " ;

}
Reading public key information from a file
private void Button7_click (object sender, System.EventArgs e)
{
StreamReader SR;
Open = new OpenFileDialog ();
Open. Filter= "Text File (*.txt) |*.txt| All File (*.*) |*.* ";
Open. ShowDialog ();
if (open. ShowDialog () ==dialogresult.ok)
{
sr = new StreamReader (open. FILENAME,UTF8ENCODING.UTF8);
}
Else
{
MessageBox.Show ("An error has occurred!") ");
Return
}
Readpublickey = Sr. ReadToEnd ();
Sr. Close ();
}
Reading private key information from a file
private void Button8_click (object sender, System.EventArgs e)
{
Open = new OpenFileDialog ();
Open. Filter= "Text File (*.txt) |*.txt| All File (*.*) |*.* ";
Open. ShowDialog ();
StreamReader sr = new StreamReader (open. FILENAME,UTF8ENCODING.UTF8);
Readprivatekey = Sr. ReadToEnd ();
Sr. Close ();
}



}
}